What Is Claude Code?
Claude Code is a command-line tool powered by a large language model. Beyond the familiar chat interface, Claude Code can read and write files, execute commands, and verify its own output — making it particularly effective for coding tasks where iterative feedback is essential.
Getting Started: First Things First
When you open Claude Code in a new repository, start by asking it to:
- Understand the repo — “What does this repo do?”
- Explain how to run it — build steps, entry points, dependencies
- Set up the environment — install requirements, configure tooling
This gives Claude the context it needs to be useful from the start.
Running Multiple Claude Instances
One of the most powerful patterns is running 5+ Claude instances in parallel, each handling a different task:
- Reading & understanding code — exploring unfamiliar parts of the codebase
- Debugging — isolating and fixing bugs
- Git operations — committing changes, creating pull requests
- Cluster management — submitting jobs, monitoring logs, checking job status
- Planning — designing new features or refactoring strategies
Why Multiple Instances?
Each instance can focus on a single concern without losing context:
| Instance | Task |
|---|---|
| 1 | Babysit a running job |
| 2 | Debug a failing test |
| 3 | Fix a failed job |
| 4 | Plan a new feature |
| 5 | Write and iterate on code |
Tricks
Name Your Instances
Use /rename to label each Claude instance by its task (e.g., “debugger”, “job-monitor”, “feature-planner”). This keeps your work organized when juggling multiple sessions.
The Importance of Feedback Loops
The single most important principle for using Claude effectively:
Always set up feedback loops.
Claude works best when it can execute code, observe the result, and iterate. Without feedback, Claude is just guessing.
Bad pattern: Ask Claude to write code, then manually check if it works.
Good pattern: Ask Claude to write code and create unit tests, so it can verify its own output automatically.
Example: Writing Code with Feedback
- Tell Claude what you want to build
- Ask it to write unit tests alongside the implementation
- Claude runs the tests, sees failures, and fixes them — all in a loop
This “write → test → fix” cycle is where Claude truly shines.
Anti-Patterns
- No feedback loop — Asking Claude to generate code without any way to verify it leads to unreliable results
- Single long session — Instead of one overloaded session, split work across focused instances